Design alongside your favorite agent. You call the shots; it builds the real thing — not a picture — and Unicorn Horn turns it into a live preview your developers can actually use.
Stop paying for it twice. Design it once, in code.
A mockup gets paid for twice: once to draw it, and again to rebuild it in code, with rounds of back-and-forth in between. Plug in your own numbers to see what that costs.
Your handoff, per month
Screens handed off12
Hours to rebuild each from a mockup6 h
Hours of back-and-forth on each2 h
Hourly rate$85
The handoff tab
monthly · the old way
Screens handed off
12
Rebuild from mockup
× 6 h
Back-and-forth
+ 2 h
Hourly rate
× $85/h
Hours spent
96 h
Paid for twice
Over a year$97,920
With Unicorn Horn
Rebuild from mockup72 h
It's already code. Developers wire it in.
Back-and-forthfewer rounds
Everyone reviews the running component.
Designed once · Built once
[01]
No rebuild.
The preview is the component, in your team's framework. Developers start from working code, not from a picture of it.
[02]
No second AI bill.
Unicorn Horn runs on the agent you already pay for — Claude Code, Cursor or any MCP client.
[03]
Fewer rounds.
Reviewers open the running component at real screen sizes, so what gets approved is what gets built.
How it works
From prompt to shareable link in three steps.
[01]
Connect your agent
Add Unicorn Horn as an MCP server in Claude Code, Cursor or any MCP client. One URL, OAuth or a token.
[02]
Describe what you want
Your agent translates your prompt into real components — React, Vue, Svelte, plain HTML and more — and publishes them with create_preview.
[03]
Share the live preview
Every preview gets a public link. Your team opens the running component, resizes it, flips versions, reads the code.
Features
Built for reviewing real UI. Not screenshots of it.
Versions
v7Tighten tile spacingLive
v6Add hourly forecast18m ago
v5Dark mode pass1h ago
v4Restored in dashboard3h ago
v7Live
Every change is a version. Your agent iterates; Unicorn Horn keeps the history. Flip between versions or restore an earlier one.
Phone · 375 × 812
Any screen size. Flip between desktop, tablet and phone — portrait or landscape — in the viewer.
6 previews
Checkout flow
Stack·/c/checkout-flow
Collections. Group related previews — a flow, a feature, a design review — behind one link.
Read the code behind it. Every preview carries its source. Open it, copy it, hand it to whoever ships it.
Sandboxed. Agent-built code runs in a sandboxed frame, isolated from the app and your account.
Team workspaces. Previews, collections and tokens belong to your organization.
OAuth or tokens. Sign your agent in with OAuth, or issue an API token from the dashboard.
The Unicorn System
Every unicorn starts with a horn.
Three parts, one system. The Horn hands your design to developers as real code. The Unicorn is the designer who writes it. The Scan shows where it all ends up.
unicornhorn.app/p/night-drive
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HornUnicornScan
The Horn
For designers who direct agents.
Code is the language developers and the web speak. With an agent, you speak it too: describe what you want, and it's built in your developers' framework of choice. Unicorn Horn turns it into a live preview they can open, inspect and ship.
The Unicorn
For designers who code.
The design engineer: you design in the medium itself and own the design arm of the product end to end, from tokens and components to the docs your team builds with. What's a design engineer?
The Scan
For systems out in the wild.
Once your components ship, UhScan reads the repos your teams build in and shows what's adopted, what's drifting and what should have been retired. See UhScan
Describe it. Preview it.Share it.
Connect your agent in a minute. Send your team a link to the real thing, not a picture of it.
